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What he said https://www.benjaminairguns.com/benjamin-degassing-tool

Thank you, Ill try the 15.89 and post them. Sorry about the delay, still trying to get the trigger better and std dev between shots lower with tuning, but it is better. I was really hoping to find a cookie cutter method to crank this up but for now at least its a custom formula to keep it...

Hey John thanks again! Here is the final with Crosman domes 14.3 and JSB 18.1. The FX Chrony I use dropped a couple shots on the JSBs. One last note, I ended up polishing the end of the bolt that goes into the barrel and this seemed to get better results. 

Hi, and apologies for the delayed wrap up. First I want to thank John (FuzzyGrub) for all the help and patience. We are lucky to have you helping us here John! The short version of a long story is, the bolt cycling system, and bolt timing coordinated with the magazine indexing speed, is...

Have a brand spankin new AEA Challenger. This is the newer Challenger model listed at 659 on Bins site here: AEA Precision Challenger Bullpup 357/9MM.45 &.50 Cal (Tube Tactical Clamp) | AEA AIRGUN I got it, cleaned it all up to get rid of the factory grit and grease, oiled it, shot it, and...

Can anyone comment on how the 700 bottles hold up with use? 

From the last test. Reg pressure, and pics of typical misfeeds

Last update for today. Turned the reg down to 120bar, 1740 PSI. Fed some single pellets and got a surprising shot string: Shot count: 8 Low: 882 Hi: 890 Avg: 889 Spread: 88 STD Dev: 4.1 895 888 889 893 884 890 882 891 every shot sounded normal so I loaded up three different magazines. First...

Another quick update. Decreasing the HS by 2 full turns returned to no hammer rebound latch and low 650ish FPS. Increasing by 1 full turn of HS results in brief full auto burst but jam happens almost immediately. 850 FPS. The forward assist system is going back to stock and will try reduced...

So I went a little off script here to do another experiment. The barrel gasket was being eaten by the bolt probe around the air inlet. Maybe 1/2 of the ORing was removed. Replaced with a new ORing and took. Close look at the bolt probe, it was sharp around the air inlet where it was opened...

Sorry I was unclear, the single shots did do the bop-bop thing. I’ll look at the mags more closely and see how they are in the breech. I have been using 5 magazines labeled 1-5 and generally in that order. Magazine 1 was hammered by the bolt probe beyond usability early on, but I carved out...

Hey thanks! The pellets ending up like that can’t be a coincidence… All the single shots did do the double bop at 2050 psi I’ll try again as it is back together (will test at 1650 and see if it will cycle normally again.) if it is still bopping I’ll try the assist and let you know. The...

It might not be clear from the pics the pellets have a cut on the dome from where they hit the breech instead of entering the barrel. Heavier pellets (18.1 JSB) tested with the Lane set up end up the same way. It seems like the basic issue is slowing down the bolt cycling (or speeding up the...

The pop-pop-misfeed magazine indexing dilemma… it seemed clear in the much earlier experiments with the stock reg that the bolt was cycling a lot fast than the mag would index and taking and smashing or taking a bite out of the plastic fin while it was completing its turn. It seems like...

The stock setup is a pretty incredible balance indeed. And thanks again, I am prone to jump to conclusions and got a little confused trying to understand the problem. Appreciate the restatement above, that helps. Installed Lane reg at the recommended 1850psi setting, and power was the same? ...

Got the TP situation fixed. It is smaller than previous but didn’t want to drill off the ends again and end up stuck back there shooting orings. Now the the TP seems fixed and stable, cycling is a problem. Starting at about 2050 PSI the rifle will not cycle. It is not destroying magazines, it is...

Found some aluminum spacers. Will try to drill one out to 0.175 (or about the same diameter as the hole in the gaskets) and cut to a little longer than the stock TP and give that a shot instead of messing with plastic. The stock ID is 0.165 and the stock OD is 0.255, just a bit smaller than the...

Well a little update. I spent some time baffled about why I kept turning the reg pressure up, seeing it on the gauge, and the fps just kept running at the same place. Or even lower than previously. Then I noticed a little grease coming from between the pressure tube and the breech (I smeared a...

Sounds like I bought the “bargain” spare air tube a bit too early. And yes you are correct, I needed a BSP thread plug for the SAM gauge block. And a gauge block now that I stripped the stock one learning that thread lesson… the little gauge adapter is NPT for the gauge and BSP at the block...